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- Title
Gravimetric Constraints on the Hydrothermal System of the Campi Flegrei Caldera.
- Authors
Young, N.; Isaia, R.; Gottsmann, J.
- Abstract
The Campi Flegrei caldera (Italy) has been undergoing unrest over the past five decades including episodes of rapid ground deformation, seismicity, and variations in gas emissions. Hydrothermal fluids and gases are released most vigorously in the central sector of the caldera at the fumarolic fields of Solfatara volcano and Pisciarelli. We conducted a high‐precision gravity survey coupled with inverse modeling to image the shallow (<2‐km depth) structure of the hydrothermal feeder system. Results indicate the presence of three low density bodies beneath Pozzuoli, Astroni volcano and the Solfatara/Pisciarelli fumarolic fields. The first two are inferred to be sealed hydrothermal systems trapped beneath impermeable cap rock, while the latter depicts a plume‐like geothermal feeder system reaching the surface via a combination of Solfatara's maar‐diatreme structure and the intersection of NW‐SE and NE‐SW trending regional faults. The density contrasts of the reservoirs from background values are best explained by a multiphase mixture of caldera fill containing a secondary and interconnected void volume fraction of between 0.2 and 0.3 that hosts a vapor volume fraction ψv of between 0.38 and 1 and a liquid volume fraction ψl fraction of between 0 and 0.62. This work highlights the control of volcano‐tectonic structures on fluid movement in the shallow crust of hydrothermally active volcanic systems undergoing sustained or periodic unrest. Key Points: Hydrothermal plumbing of the central sector of the Campi Flegrei is controlled by volcano‐tectonic structuresThree shallow‐seated (<1.5 km depth) hydrothermal feeder systems are imaged at Pozzuoli, Solfatara/Pisciarelli volcano, and Astroni volcanoLow densities of feeder systems are explained by porous caldera fill material with between 0.38 and 1 vapor volume fraction and between 0 and 0.62 liquid volume fraction in secondary void space
- Subjects
PHLEGRAEAN Plain (Italy); GRAVIMETRY; HYDROTHERMAL vents; INDUCED seismicity; VOLCANISM; DIATREMES
- Publication
Journal of Geophysical Research. Solid Earth, 2020, Vol 125, Issue 7, p1
- ISSN
2169-9313
- Publication type
Article
- DOI
10.1029/2019JB019231